Mercurial 2.9 compatibility (#16177)

git-svn-id: http://svn.redmine.org/redmine/trunk@12930 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/mercurial/redminehelper.py

@@ -79,8 +79,13 @@ def _tags(ui, repo):
 def _branches(ui, repo):
     # see mercurial/commands.py:branches
     def iterbranches():
+        if hasattr(repo, 'branchtags'):
+            # Mercurial < 2.9
             for t, n in repo.branchtags().iteritems():
                 yield t, n, repo.changelog.rev(n)
+        else:
+            for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
+                yield tag, tip, repo.changelog.rev(tip)
     def branchheads(branch):
         try:
             return repo.branchheads(branch, closed=False)